I agree kane is stale, but it would work with him looking weak under wyatt and having Wyatt put him out for good. Kane is still a big monster, and it could lead to an awesome promo with DB "being cocky" and letting Kane know it was actually he who was the weak link all along. I'm expecting someone to heel turn out of the crew, and a masked monster version of kane wouldnt work for long, but it would give Wyatt some cred on putting even the toughest monsters down to start. I dont expect it to last past Summerslam.Kane's not over enough for Wyatt imo. People would just end up being more fascinated with Wyatt and his character, as Kane is just Kane now - stale.
Regarding RVD, I too doubt he appears before MITB as he's not advertised. The feud still could happen with Wyatt just taking him out at MITB - good way for RVD to lose without looking weak. As for Cena, yeah, I was basing that off the scenario that Cena loses this weekend. No way does Wyatt contest for the title yet.